package servlets.admin.userManagement;

import dbProcs.Getter;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.owasp.encoder.Encode;
import utils.ShepherdLogManager;
import utils.Validate;

/**
 * This class is used by View classes to generate class displays that change based on user input.
 * <br>
 * <br>
 * This file is part of the Security Shepherd Project.
 *
 * <p>The Security Shepherd project is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software Foundation, either
 * version 3 of the License, or (at your option) any later version.<br>
 *
 * <p>The Security Shepherd project is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE. See the GNU General Public License for more details.<br>
 *
 * <p>You should have received a copy of the GNU General Public License along with the Security
 * Shepherd project. If not, see <http://www.gnu.org/licenses/>.
 *
 * @author Mark Denihan
 */
public class GetPlayersByClass extends HttpServlet {

  private static final long serialVersionUID = 1L;
  private static final Logger log = LogManager.getLogger(GetPlayersByClass.class);

  /**
   * Initiated by assignPlayers.jsp. This servlet returns options for inside html select
   *
   * @param classId theClass in which users must be found
   * @param csrfToken User's CSRF Token
   */
  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    // Setting IpAddress To Log and taking header for original IP if forwarded from proxy
    ShepherdLogManager.setRequestIp(request.getRemoteAddr(), request.getHeader("X-Forwarded-For"));
    log.debug("*** servlets.Admin.GetPlayersByClass ***");

    PrintWriter out = response.getWriter();
    out.print(getServletInfo());
    HttpSession ses = request.getSession(true);
    Cookie tokenCookie = Validate.getToken(request.getCookies());
    Object tokenParmeter = request.getParameter("csrfToken");
    if (Validate.validateAdminSession(ses, tokenCookie, tokenParmeter)) {
      ShepherdLogManager.setRequestIp(
          request.getRemoteAddr(),
          request.getHeader("X-Forwarded-For"),
          ses.getAttribute("userName").toString());
      if (Validate.validateTokens(tokenCookie, tokenParmeter)) {
        boolean notNull = false;
        boolean notEmpty = false;
        String[] classInfo = new String[2];
        try {
          log.debug("Getting ApplicationRoot");
          String ApplicationRoot = getServletContext().getRealPath("");
          log.debug("Servlet root = " + ApplicationRoot);

          log.debug("Getting Parameters");
          String classId = (String) request.getParameter("classId");
          log.debug("classId = '" + classId + "'");

          // Validation
          log.debug("Ensuring not empty");
          if (classId != null) {
            log.debug("classId was not null");
            notEmpty = (!classId.isEmpty());
          }
          if (notEmpty && classId != null) {
            log.debug("classId was not empty");
            classInfo = Getter.getClassInfo(ApplicationRoot, classId);
            if (classInfo == null) {
              classId = null;
              log.debug("classInfo was not returned, nulling classId");
            }
          } else {
            log.debug("classId was empty, nulling");
            classId = null;
          }
          if (classId == null || classInfo != null) {
            ResultSet playerList = Getter.getPlayersByClass(ApplicationRoot, classId);
            String players = playersInOptionTags(playerList);
            out.print(players);
          } else {
            // Validation Error Responses
            if (!notNull || !notEmpty) {
              log.error("Null values detected");
            }
            out.print("fail");
          }
        } catch (Exception e) {
          log.error("Get Players by Class Error: " + e.toString());
          out.print("fail");
        }
      } else {
        log.debug("CSRF Tokens did not match");
        out.print("fail");
      }
    } else {
      log.debug("Not an Administrator!");
      out.print("fail");
    }
    log.debug("*** GetPlayersByClass END ***");
  }

  public static String playersInOptionTags(ResultSet playerList) {
    String players = new String();

    log.debug("Iterating through playerList");
    try {
      playerList.beforeFirst();
      while (playerList.next()) {

        players +=
            "<option value=\""
                + Encode.forHtmlAttribute(playerList.getString(1))
                + "\">"
                + Encode.forHtml(playerList.getString(2))
                + "</option>";
        log.debug("Adding " + playerList.getString(2) + " to output");
      }
    } catch (SQLException e1) {
      log.error("Error Occurred when handling playerList ResultSet");
    }
    log.debug("Returning: " + players);
    return players;
  }
}
